Diet, Food and Related Canine Behaviour
Feeding your dog a well balanced diet is critical to positive long term health, and indeed diet can affect behaviour. It possibly doesn't play as big a part in behaviour as we might like to think, but in some cases depending on the combination of the breed and the brand of food I have seen fireworks as a result of the 'wrong' combination. I always address diet as a part of a comprehensive behavioural assessment.
Opinion varies somewhat on what is the best dietary plan for a dog, and you'll need to understand that no two dogs are alike in what is best for the dog. As a result you'll need to remain flexible when finding the right brand and feeding system.
The main options with feeding are: A good quality dried commercial feed, a home cooked recipe approach or a raw meat and bones approach. All of these have pros and cons depending on your time and inclination.